Originally Posted By edpmedic:Thanks so just welding is ok without the pinning has I understand. Isn't Silver Solder the same has welding?

I have been useing the High Temp paste without pinning.

High Temp Solder? This is not the same a silver solder. Sure it is silver in color, but silver solder melts at about 1100 degrees F. If your barrel is 16" why do you want to permantly attach a flash suppressor? Are you in a state that requires it? Probably so since you are from NY.